<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <title>圆角控制</title>
  <style>
    body {
      padding: 100px;
    }

    article {
      border: solid 1px #ddd;
      /* border-radius: 10px 20px 30px 40px; */
      /* border-top-left-radius: 30px;
      border-top-right-radius: 30px;
      border-bottom-left-radius: 30px;
      border-bottom-right-radius: 30px; */
      border-radius: 50%;
      height: 300px;
      width: 300px;
    }

    div {
      /* 130 130*/
      padding: 30px 50px 100px 80px
    }
    div>em {
      border-bottom: solid 5px red;
      font-size: small;
      border-radius: 50%;
 
    }

  </style>
</head>

<body>

  <article>
    <!-- <a href="">MYSQL</a> -->
    <!-- <a href="">CSS</a> -->
    <div>houdunren.com<em>houdunren</em></div>
  </article>
</body>

</html>